EP0595407B1 - Technical apparatus, particularly electromechanical drive for information carriers - Google Patents

Technical apparatus, particularly electromechanical drive for information carriers Download PDF

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Publication number
EP0595407B1
EP0595407B1 EP93202940A EP93202940A EP0595407B1 EP 0595407 B1 EP0595407 B1 EP 0595407B1 EP 93202940 A EP93202940 A EP 93202940A EP 93202940 A EP93202940 A EP 93202940A EP 0595407 B1 EP0595407 B1 EP 0595407B1
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EP
European Patent Office
Prior art keywords
deck plate
bridge element
technical device
web
moulding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93202940A
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German (de)
French (fr)
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EP0595407A3 (en
EP0595407A2 (en
Inventor
Georg c/o Philips Patentverwaltung GmbH Kämmler
Herbert Platzer
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Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Koninklijke Philips Electronics NV
Philips Electronics NV
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Publication of EP0595407A2 publication Critical patent/EP0595407A2/en
Publication of EP0595407A3 publication Critical patent/EP0595407A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14754—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14344—Moulding in or through a hole in the article, e.g. outsert moulding
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/06—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using web-form record carriers, e.g. tape
    • G11B25/063—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using web-form record carriers, e.g. tape using tape inside container
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B31/00—Arrangements for the associated working of recording or reproducing apparatus with related apparatus
    • G11B31/003—Arrangements for the associated working of recording or reproducing apparatus with related apparatus with radio receiver
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14754—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies
    • B29C2045/14762—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies using shrinkage

Definitions

  • the invention relates to a technical device, in particular an electromechanical drive for moving information carriers with at least one plastic functional part formed on a base plate, which is injection molded onto the base plate in outsert molding technology and which consists of at least one web penetrating an opening in the base plate and on the base plate surfaces are holding pieces that the web connects and the plastic shrinks after injection molding.
  • the breakthrough extension is essentially conical. After shrinking, a conical extension provides a predictable lifting of the web flange from the opening wall of the base plate.
  • the angle ⁇ of the taper between the Base plate surface and the conical diameter expansion is approximately 40 ° to 50 °, preferably 45 °.
  • a taper of 40 ° to 50 °, preferably 45 °, has proven to be particularly suitable for achieving the required freedom of movement.
  • other angular degree configurations are also possible, a change in the angle in the direction of 0 ° reducing the free rotational mobility and a change in the angle in the direction of 90 ° reducing the ability to guide in the opening.
  • the functional part is a rotary bearing part or a slide, which are freely movable on the base plate.
  • the training according to the invention is equally suitable for both types of movable functional parts.
  • FIG. 1 shows from a device 1, for example a car radio, the base plate 2 of a magnetic tape cassette drive, onto which stationary plastic functional parts are injection molded using outsert molding technology.
  • Such stationary functional parts 3 can be, for example, a circuit board 4 or supports 5 for mounting a motor 6.
  • Partially crystalline thermoplastic whose shrinkage without filler is in the order of 1% to 3%, is preferably used as the plastic.
  • the shrinkage can be further reduced by adding fillers. This has the advantage that, on the one hand, the web width can be increased and, on the other hand, the tilting is reduced.
  • a head plate 8 can be pivoted on the base plate 2, on which legs 9 and 11 engage in corner regions 12 and 13.
  • the base part 8a of the head plate carries a magnetic head 16 with pressure rollers 19 which interact with holders 17 with sound waves 18.
  • the brackets of the pressure rollers 19 acting as functional parts 17 can be pivoted about axes 21.
  • a longitudinal slot 23 is provided in the base plate 2, in which a slide 44, which also acts as a functional part, is movable.
  • the stationary component of the bearing 45 is formed by the metallic base plate 2 with an opening 46 provided thereon.
  • the movable component is formed by a plastic functional part 45a formed by injection molding.
  • the opening 46 in the bearing 45 is circular or slot-like and has an inner wall 47 which receives the web 48.
  • the inner wall 47 of the opening 46 runs from one plate surface 2a to the other plate surface 2b through the plate 2. As can be seen from FIG. 2, the inner wall 47 points from the plate surface 2a to the plate surface 2b in the area of the Plate surface 2b a conical diameter expansion 49.
  • the angle ⁇ between the surface 50 of the diameter extension 49 and the plate surface 2b is approximately 45 °.
  • the movable functional part 45a of the bearing 45 is formed by the web 48, holding pieces 51a and 51b and a collar 52 on the web.
  • the movable functional part 45a is injection molded onto the plate 2 in an injection molding process.
  • the holding pieces 51a and 51b form directly on the plate surface 2a, which can be separated from one another, but can also be formed in one piece.
  • the collar 52 arises during spraying in that the injection mold lies closely against the outer wall 48a of the web to be sprayed and the wedge space 53 is filled with plastic, which then forms the collar 52.
  • the web 48 is preferably injection molded to form a central center hole 54.
  • the web 48 shrinks both in the radial direction and in the axial direction.
  • the flange 52 moves both radially inward and axially in the direction of the holding pieces 51 and 51b. From the combination of the radial shrinkage and the axial shrinkage, a gap 55 is formed between the flange wall 54 and the wall 50 of the extension, which brings about the rotational mobility of the functional part 45a.
  • the molded web 48 also becomes round, and the functional part 45a is a freely movable rotating part after the spraying. If the opening 46 is slot-shaped, as is shown in FIG. 1 for the slot 23, then the web 48 will be strip-shaped, and the functional part 45a is then a slide.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

Die Erfindung bezieht sich auf ein technisches Gerät, insbesondere elektromechanisches Laufwerk zum Bewegen von Informationsträgern mit wenigstens einem an einer Grundplatte gebildeten Kunststoffunktionsteil, das in Outsert-Moulding-Technik an die Grundplatte angespritzt ist, das aus wenigstens einem einen Durchbruch der Grundplatte durchgreifenden Steg und an den Grundplattenoberflächen befindlichen Haltestücken besteht, die der Steg verbindet und dessen Kunststoff nach dem Spritzgießen schrumpft.The invention relates to a technical device, in particular an electromechanical drive for moving information carriers with at least one plastic functional part formed on a base plate, which is injection molded onto the base plate in outsert molding technology and which consists of at least one web penetrating an opening in the base plate and on the base plate surfaces are holding pieces that the web connects and the plastic shrinks after injection molding.

Technische Geräte, bei denen tragende Metallplatten mit angespritzten Kunststoffteilen versehen sind, sind bekannt. Die Fertigungstechnik derartiger tragender Metallplatten ist unter dem Namen Outsert-Moulding-Technik bekannt. Die an der tragenden Metallplatte gebildeten Funktionsteile dienen den verschiedensten Zwecken, wie der Halterung, der Lagerung oder der Führung weiterer Funktionsteile. Die Verbindungstechnik zwischen den aufgespritzten Funktionsteilen und der tragenden Metallplatte besteht immer darin, daß ein Durchbruch in der Metallplatte derart umspritzt wird, daß beiderseits der Plattendurchbrüche gebildete Kunststoffhaltestücke mittels eines den Durchbruch durchgreifenden Steges miteinander verbunden sind. Infolge der unvermeidlichen Schrumpfung des Kunststoffes nach dem Spritzen zieht der sich verkürzende Steg die Haltestücke von beiden Plattenoberflächen an diese heran. Damit kommt ein verhältnismäßig fester Sitz zustande, der gerade noch ein Verdrehen in eine gewünschte Lage ermöglicht, der aber nicht mit einer Lagerausbildung vergleichbar ist, bei der sich die Teile während des Betriebes ständig bewegen, beispielsweise drehen oder verschieben.Technical devices in which supporting metal plates are provided with molded plastic parts are known. The manufacturing technology of such load-bearing metal plates is known as the outsert molding technique. The functional parts formed on the supporting metal plate serve a wide variety of purposes, such as holding, storing or guiding further functional parts. The connection technology between the sprayed-on functional parts and the supporting metal plate always consists in the fact that an opening in the metal plate is extrusion-coated in such a way that plastic holding pieces formed on both sides of the plate openings are connected to one another by means of a web penetrating the opening. As a result of the inevitable shrinkage of the plastic after spraying, the shortening web pulls the holding pieces from both plate surfaces towards them. This results in a relatively tight fit, which just barely allows twisting into a desired position, but which is not comparable to a camp training in which the parts move constantly during operation, for example rotating or moving.

Es ist aus der DE 39 11 746 C2 (PHD 89-053) bekannt, eine einem Dreh- oder Schiebelager gleichkommende Beweglichkeit durch eine Deformation der Aufspritzung nach dem Spritzprozeß herbeizuführen.It is known from DE 39 11 746 C2 (PHD 89-053) to bring about a mobility that is equivalent to a rotary or sliding bearing by deforming the injection after the injection molding process.

Aus der JP 57-197139 A ist es bekannt, zwischen den Formhohlraum für ein Haltestück der beschriebenen Art und die zugehörige Plattenoberfläche ein Abstandsstück zu fügen, welches beim Spritzvorgang sehr sorgfältig und sicher festgehalten werden muß. Nach dem Abspritzvorgang wird dieses Abstandsstück entfernt, womit das aufgespritzte Teil lagerfähig wird. Das Einfügen, Festhalten und spätere Entfernen des Abstandsstückes ist für eine Massenfertigung zu aufwendig.From JP 57-197139 A it is known to add a spacer between the mold cavity for a holding piece of the type described and the associated plate surface, which must be held very carefully and securely during the spraying process. After the spraying process, this spacer is removed, making the sprayed-on part storable. The insertion, holding and later removal of the spacer is too expensive for mass production.

Es ist auch bereits vorgeschlagen worden, durch eine Variation der Dicke der Haltestücke eine unterschiedliche Schrumpfkraft und damit eine mehr oder weniger bewegliche Verankerungen in den entsprechenden Lagerpunkten zu erreichen. Diese Verankerungen sind jedoch nicht leichtgängig genug, um damit Hebel- oder Laufradlager zu gestalten. Außerdem können die Haltestücke rund um den Durchbruch in der Metallplatte nicht beliebig dünn gemacht werden, da in diesen Fällen die Füllung des Durchbruchs mit dem Steg und der daran befestigten Haltestücke beim Spritzgießen nicht mehr gewährleistet ist. Auch die mechanische Festigkeit einer Anbindung von Funktionsteilen an sehr dünne Haltestücke ist nicht ausreichend groß.It has also already been proposed to achieve a different shrinkage force and thus a more or less movable anchorage in the corresponding bearing points by varying the thickness of the holding pieces. However, these anchorages are not smooth enough to design lever or impeller bearings. In addition, the holding pieces around the opening in the metal plate cannot be made arbitrarily thin, since in these cases the filling of the opening with the web and the holding pieces attached thereto is no longer guaranteed during injection molding. The mechanical strength of a connection of functional parts to very thin holding pieces is also not sufficiently large.

Es ist Aufgabe der Erfindung, bei einem Laufwerk eines technischen Gerätes an einer Grundplatte in Outsert-Moulding-Technik gebildete Funktionsteile beim Spritzvorgang so zu gestalten, daß sie eine während des Betriebes benötigte Drehbeweglichkeit oder Verschiebemöglichkeit bieten bei Einsparung eines nachträglichen Bearbeitungsvorganges.It is an object of the invention to provide functional parts formed in a drive of a technical device on a base plate in outsert molding technology To design the injection molding process in such a way that it offers a rotational mobility or displacement possibility required during operation while saving on a subsequent machining operation.

Die gestellte Aufgabe ist erfindungsgemäß dadurch gelöst, daß sich das Funktionsteil an der Grundplatte durch sein Schrumpfen selbsttätig frei beweglich macht durch folgende Gestaltung:

  • 1. der Steg ist nur an einer Grundplattenoberfläche mit Haltestücken versehen;
  • 2. der Durchmesser des Durchbruchs in der Grundplatte erweitert sich zur Oberfläche hin, die frei von Haltestücken ist;
  • 3. der Steg ist mit einem Flansch versehen, der beim Einfließen von Kunststoff während des Spritzgießens die Durchmessererweiterung ausfüllt.
The object is achieved according to the invention in that the functional part on the base plate automatically makes itself freely movable due to its shrinkage by the following design:
  • 1. the web is provided with holding pieces only on a base plate surface;
  • 2. the diameter of the opening in the base plate widens towards the surface which is free of holding pieces;
  • 3. The web is provided with a flange which fills the diameter widening when plastic is injected during injection molding.

Bei einer derartigen Ausbildung des Funktionsteiles im Rahmen des Abspritzvorganges hat dieses nach dem Schrumpfen noch eine derartige Beweglichkeit, daß es während des Gerätebetriebes nach Belieben frei beweglich oder verschieblich ist. Das Lösen des Funktionsteils von der Grundplatte zum Erreichen der Freibeweglichkeit ist einfach eine Folge des Schrumpfvorganges.With such a design of the functional part in the context of the spraying process, after shrinking, it still has such mobility that it is freely movable or displaceable during operation of the device. Detaching the functional part from the base plate to achieve freedom of movement is simply a consequence of the shrinking process.

Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß die Durchbruchserweiterung im wesentlichen konisch ist. Eine konische Erweiterung erbringt nach dem Schrumpfen ein vorausberechenbares Abheben des Stegflansches von der Durchbruchswand der Grundplatte.According to a further embodiment of the invention it is provided that the breakthrough extension is essentially conical. After shrinking, a conical extension provides a predictable lifting of the web flange from the opening wall of the base plate.

Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß der Winkel α der Konizität zwischen der Grundplattenoberfläche und der konischen Durchmessererweiterung ca. 40° bis 50°, vorzugsweise 45°, beträgt. Eine Konizität von 40° bis 50°, bevorzugt 45°, hat sich als besonders geeignet erwiesen, die geforderte Freibeweglichkeit zu erreichen. Selbstverständlich sind auch andere Winkelgradausbildungen möglich, wobei eine Veränderung des Winkel in Richtung auf 0° die freie Drehbeweglichkeit vermindert und eine Veränderung des Winkels mehr in Richtung auf 90° die Führungsfähigkeit in dem Durchbruch verringert.According to a further embodiment of the invention it is provided that the angle α of the taper between the Base plate surface and the conical diameter expansion is approximately 40 ° to 50 °, preferably 45 °. A taper of 40 ° to 50 °, preferably 45 °, has proven to be particularly suitable for achieving the required freedom of movement. Of course, other angular degree configurations are also possible, a change in the angle in the direction of 0 ° reducing the free rotational mobility and a change in the angle in the direction of 90 ° reducing the ability to guide in the opening.

Nach einer weiteren Ausgestaltung der Erfindung ist vorgesehen, daß das Funktionsteil ein Drehlagerteil oder ein Schieber ist, die an der Grundplatte frei beweglich gelagert sind. Für beide Arten von beweglichen Funktionsteilen eignet sich die Ausbildung nach der Erfindung gleich gut.According to a further embodiment of the invention, it is provided that the functional part is a rotary bearing part or a slide, which are freely movable on the base plate. The training according to the invention is equally suitable for both types of movable functional parts.

Die Erfindung wird anhand der Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 ein technisches Gerät, insbesondere ein Autoradio mit einem Laufwerk für bandförmige Informationsträger, geöffnet und in schaubildlicher Darstellung,
  • Fig. 2 im Schnitt eine Grundplatte mit einem in Outsert-Moulding-Technik angespritzten Funktionsteil, das nach dem Anspritzen an die Grundplatte an dieser dreh- oder schiebebeweglich ist.
The invention is explained in more detail with reference to the drawing. Show it:
  • 1 shows a technical device, in particular a car radio with a drive for tape-shaped information carriers, opened and in a diagrammatic representation,
  • Fig. 2 in section a base plate with a molded part in outsert molding technique, which is rotatable or sliding after injection molding onto the base plate.

Fig. 1 zeigt aus einem Gerät 1, beispielsweise einem Autoradio, die Grundplatte 2 eines Magnetbandkassettenlaufwerkes, an die in Outsert-Moulding-Technik ortsfeste Kunststoffunktionsteile angespritzt sind. Solche ortsfesten Funktionsteile 3 können beispielsweise eine Schaltungsplatte 4 oder Stützen 5 zum Lagern eines Motors 6 sein. Als Kunststoff kommt dabei vorzugsweise teilkristalliner thermoplastischer Kunststoff in Betracht, dessen Schrumpfung ohne Füllstoff in der Größenordnung von 1% bis 3% liegt. Durch eine Beimischung von Füllstoffen läßt sich die Schwindung weiter reduzieren. Dies hat den Vorteil, daß sich zum einen die Stegbreite vergrößern läßt und zum anderen das Kippen reduziert wird.Um eine Lagerachse 7 ist an der Grundplatte 2 eine Kopfplatte 8 verschwenkbar, an der Schenkel 9 und 11 in Eckbereichen 12 und 13 angreifen. Das Basisteil 8a der Kopfplatte trägt einen Magnetkopf 16 mit über Halterungen 17 mit Tonwellen 18 zusammenwirkender Andruckrollen 19.1 shows from a device 1, for example a car radio, the base plate 2 of a magnetic tape cassette drive, onto which stationary plastic functional parts are injection molded using outsert molding technology. Such stationary functional parts 3 can be, for example, a circuit board 4 or supports 5 for mounting a motor 6. Partially crystalline thermoplastic, whose shrinkage without filler is in the order of 1% to 3%, is preferably used as the plastic. The shrinkage can be further reduced by adding fillers. This has the advantage that, on the one hand, the web width can be increased and, on the other hand, the tilting is reduced. Around a bearing axis 7, a head plate 8 can be pivoted on the base plate 2, on which legs 9 and 11 engage in corner regions 12 and 13. The base part 8a of the head plate carries a magnetic head 16 with pressure rollers 19 which interact with holders 17 with sound waves 18.

Die als Funktionsteile 17 wirkenden Halterungen der Andruckrollen 19 sind um Achsen 21 verschwenkbar. In der Grundplatte 2 ist ein Längsschlitz 23 vorgesehen, in dem ein ebenfalls als Funktionsteil wirkender Schieber 44 beweglich ist.The brackets of the pressure rollers 19 acting as functional parts 17 can be pivoted about axes 21. A longitudinal slot 23 is provided in the base plate 2, in which a slide 44, which also acts as a functional part, is movable.

Fig. 2 zeigt im Schnitt ein Lager 45 der Halterung 17 mit der Achse 21. Den ortsfesten Bestandteil des Lagers 45 bildet die metallische Grundplatte 2 mit einem an ihr vorgesehen Durchbruch 46. Den beweglichen Bestandteil bildet ein in Spritzgießtechnik gebildetes Kunststoffunktionsteil 45a. Der Durchbruch 46 ist bei dem Lager 45 kreisrund oder schlitzartig ausgebildet und hat eine Innenwand 47, die den Steg 48 aufnimmt.2 shows in section a bearing 45 of the holder 17 with the axis 21. The stationary component of the bearing 45 is formed by the metallic base plate 2 with an opening 46 provided thereon. The movable component is formed by a plastic functional part 45a formed by injection molding. The opening 46 in the bearing 45 is circular or slot-like and has an inner wall 47 which receives the web 48.

Die Innenwand 47 des Durchbruchs 46 verläuft von der einen Plattenoberfläche 2a zur anderen Plattenoberfläche 2b durch die Platte 2 hindurch. Wie aus Fig. 2 zu ersehen ist, weist die Innenwand 47 von der Plattenoberfläche 2a zur Plattenoberfläche 2b hin im Bereich der Plattenoberfläche 2b eine konische Durchmessererweiterung 49 auf. Der Winkel α zwischen der Fläche 50 der Durchmessererweiterung 49 und der Plattenoberfläche 2b beträgt etwa 45°.The inner wall 47 of the opening 46 runs from one plate surface 2a to the other plate surface 2b through the plate 2. As can be seen from FIG. 2, the inner wall 47 points from the plate surface 2a to the plate surface 2b in the area of the Plate surface 2b a conical diameter expansion 49. The angle α between the surface 50 of the diameter extension 49 and the plate surface 2b is approximately 45 °.

Das bewegliche Funktionsteil 45a des Lagers 45 wird von dem Steg 48, Haltestücken 51a und 51b sowie einem Kragen 52 am Steg gebildet. Das bewegliche Funktionsteil 45a wird in einem Spritzgießvorgang an die Platte 2 angespritzt. Dabei bilden sich unmittelbar an der Plattenoberfläche 2a die Haltestücke 51a und 51b, die voneinander getrennt, aber auch einstückig gebildet sein können. Der Kragen 52 entsteht beim Spritzen dadurch, daß das Spritzwerkzeug eng an der zu spritzenden Außenwand 48a des Steges anliegt und der Keilraum 53 mit Kunststoff ausgefüllt wird, der dann den Kragen 52 bildet. Der Steg 48 wird vorzugsweise unter Ausbildung eines zentralen Mittelloches 54 gespritzt.The movable functional part 45a of the bearing 45 is formed by the web 48, holding pieces 51a and 51b and a collar 52 on the web. The movable functional part 45a is injection molded onto the plate 2 in an injection molding process. In this case, the holding pieces 51a and 51b form directly on the plate surface 2a, which can be separated from one another, but can also be formed in one piece. The collar 52 arises during spraying in that the injection mold lies closely against the outer wall 48a of the web to be sprayed and the wedge space 53 is filled with plastic, which then forms the collar 52. The web 48 is preferably injection molded to form a central center hole 54.

Wenn der Kunststoff nach dem Spritzen schrumpft, dann schrumpft der Steg 48 sowohl in radialer Richtung als auch in axialer Richtung. Dadurch wandert der Flansch 52 sowohl radial nach innen als auch axial in Richtung auf die Haltestücke 51 und 51b. Aus der Kombination der Radialschrumpfung und der Axialschrumpfung bildet sich zwischen der Flanschwand 54 und der Wand 50 der Erweiterung ein Spalt 55, der die Drehbeweglichkeit des Funktionsteiles 45a mit sich bringt.If the plastic shrinks after injection molding, the web 48 shrinks both in the radial direction and in the axial direction. As a result, the flange 52 moves both radially inward and axially in the direction of the holding pieces 51 and 51b. From the combination of the radial shrinkage and the axial shrinkage, a gap 55 is formed between the flange wall 54 and the wall 50 of the extension, which brings about the rotational mobility of the functional part 45a.

Ist die Innenwand 47 des Durchbruches 46 kreisrund ausgebildet, dann wird der gespritzte Steg 48 auch rund, und das Funktionsteil 45a ist nach dem Spritzen ein freibewegliches Drehteil. Ist der Durchbruch 46 schlitzförmig, wie es anhand der Fig. 1 bei dem Schlitz 23 gezeigt ist, dann wird der Steg 48 leistenförmig sein, und das Funktionsteil 45a ist dann ein Schieber.If the inner wall 47 of the opening 46 is circular, then the molded web 48 also becomes round, and the functional part 45a is a freely movable rotating part after the spraying. If the opening 46 is slot-shaped, as is shown in FIG. 1 for the slot 23, then the web 48 will be strip-shaped, and the functional part 45a is then a slide.

Claims (4)

  1. A technical device, particularly an electromechanical deck for moving information carriers, the device comprising at least one plastics function part (45a) formed on a deck plate (2), which part has been moulded onto the deck plate (2) by outsert-moulding and comprises at least one bridge element (48), which traverses a hole (46) in the deck plate (2), and retaining elements (51a, 51b), which are situated on the surfaces (2a) of the deck plate (2) and are interconnected by the bridge element (48), the plastics of said part being subject to shrinkage after injection-moulding, the function part (45a) being freely movable as a rotatable part or a slidable part, characterized in that the mobility of the function part (45a) relative to the deck plate (2) as a rotatable or slidable part is obtained automatically through its shrinkage by the following construction:
    1. the bridge element (48) has been provided with retaining elements (51a, 51b) on only one of the deck plate surfaces (2a);
    2. the diameter of the hole (46) in the deck plate (2) widens towards the surface (2b) which is free of retaining elements;
    3. the bridge element (48) has a flange (52) which fills the portion (49) of widened diameter when the plastics is injected during injection-moulding.
  2. A technical device as claimed in Claim 1, characterized in that the widened portion (49) of the hole is substantially conical.
  3. A technical device as claimed in Claim 1 or 2, characterized in that the angle α of taper between the deck plate surface (2b) and the conically widened portion (49) is approximately 40° to 50°, and preferably 45°.
  4. A technical device as claimed in any one of the Claims 1 to 3, characterized in that the function part (45a) is a rotary bearing part (45) or a sliding part (44), which parts are supported on the deck plate (2) so as to be freely movable.
EP93202940A 1992-10-27 1993-10-20 Technical apparatus, particularly electromechanical drive for information carriers Expired - Lifetime EP0595407B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4236181 1992-10-27
DE4236181A DE4236181A1 (en) 1992-10-27 1992-10-27 Technical device, in particular electromechanical drive for moving information carriers

Publications (3)

Publication Number Publication Date
EP0595407A2 EP0595407A2 (en) 1994-05-04
EP0595407A3 EP0595407A3 (en) 1995-07-19
EP0595407B1 true EP0595407B1 (en) 1997-03-05

Family

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Application Number Title Priority Date Filing Date
EP93202940A Expired - Lifetime EP0595407B1 (en) 1992-10-27 1993-10-20 Technical apparatus, particularly electromechanical drive for information carriers

Country Status (4)

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US (1) US5479305A (en)
EP (1) EP0595407B1 (en)
JP (1) JP2598455Y2 (en)
DE (2) DE4236181A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8003052B2 (en) 2006-06-27 2011-08-23 Roche Diagnostics Operation, Inc. Diagnostic tape cassette

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339450A1 (en) * 1993-11-19 1995-05-24 Philips Patentverwaltung Electromechanical mechanism for record medium, esp. car radio cassette
US5867900A (en) * 1997-08-26 1999-02-09 Ecowater Systems, Inc. Plastic coated valve rotor and a method of manufacturing
JP2004039043A (en) * 2002-07-01 2004-02-05 Mitsumi Electric Co Ltd Optical pickup
CN102782342B (en) * 2009-10-02 2014-11-26 日本艾礼富株式会社 Fixing member, proximity sensor, proximity sensor attaching structure, and producing method of proximity sensor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57197139A (en) * 1981-05-29 1982-12-03 Hitachi Ltd Composite molding of metal plate and resin
JPS5864438A (en) * 1981-10-13 1983-04-16 Nissan Motor Co Ltd Wind direction regulator
JPS59184613A (en) * 1983-04-04 1984-10-20 Hitachi Ltd Molded parts making use of outsert multiple molding method
DE3911746A1 (en) * 1989-04-11 1990-10-18 Philips Patentverwaltung TECHNICAL DEVICE, IN PARTICULAR ELECTROMECHANICAL DRIVE FOR MOVING INFORMATION CARRIERS, AND METHOD FOR PRODUCING FUNCTIONAL PARTS ON A SUPPORTING PLATE OF THE DEVICE
DE4032638A1 (en) * 1989-11-15 1991-05-16 Philips Patentverwaltung MAGNETIC TAPE CASSETTE DEVICE WITH A DRIVE FOR MAGNETIC TAPE CASSETTE (REVERSE GEAR)
JPH084268Y2 (en) * 1989-12-27 1996-02-07 シチズン時計株式会社 Molded parts and molds

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8003052B2 (en) 2006-06-27 2011-08-23 Roche Diagnostics Operation, Inc. Diagnostic tape cassette

Also Published As

Publication number Publication date
DE59305593D1 (en) 1997-04-10
JPH0652094U (en) 1994-07-15
JP2598455Y2 (en) 1999-08-09
US5479305A (en) 1995-12-26
DE4236181A1 (en) 1994-04-28
EP0595407A3 (en) 1995-07-19
EP0595407A2 (en) 1994-05-04

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